Darin Ruf, seen here in 2013, on Tuesday sprained his left wrist and sustained a cut on his right knee in a Triple A game. (AP)

WASHINGTON -- The Phillies sent Darin Ruf back to Triple A to get more at-bats.

Now, he will miss more at-bats.

Ruf suffered a sprained left wrist and sustained a cut on his right knee that will require stitches when he slid into the wall in foul territory in the first inning of Tuesday night’s game at Lehigh Valley. Ruf was playing left field at the time. A witness to the play said Ruf hit the wall hard.

“It was nasty,” the witness said.

It was not immediately known how much time Ruf would miss, but it is likely he will end up on the disabled list. It will be his second trip to the DL this season. He was on his way to making the big-league club out of spring training when he strained an oblique muscle late in camp.

Ruf, who turns 28 on July 28, recovered from the oblique injury and played in 12 minor-league games before coming to the majors for seven games in May. He was used mostly as a backup outfielder/pinch hitter and was sent back to Triple A over the weekend after getting just 10 at-bats. He had one hit -- a homer.

Ruf was expected back in the big leagues at some point, possibly to push Domonic Brown for work in left field if Brown’s bat didn’t come alive.

Now, Ruf is down again with an injury, a tough break for the Phillies’ depth and him personally.